Overedging sewing machine



p 1931. E. HAUSSLER 1,825,454

OVEREDGING SEWING MACHINE Filed June 26, 1929 3 Sheets-Sheet 1 Sept. 291931. E. HAussLER OVEREDGING SEWING MACHINE Filed June 26, 1929 3Sheets-Sheet 2 m n W a Sept. 29, 1931. AU 1,825,454

OVEREDGING SEWING MACHINE Filed June 26, 1929 3 Sheets-Sheet 3 dm sPatented Sept. 29, 1931 UFNI'TIED fs'rA LdZSAlElA nnnsr HKUssLEa,

ENFABRIK, G..M. B. .11., OF STUTTGART, GERMANY ovnnnnerne SEWINGMACHINEApplication filed .Tune"26, 1929, Serial No.

The invention relates to new and useful improvements in an o-veredgingsewing machine for formingedge covering stitches :in a fabric section.

An object. of the invention is to provide an overedge stitchingmechanism "with a means which isadapted toengage the looper thread fordrawing said thread tautsoas to lay loops the needle thread at the upperand lower facesof thefabric sect-Ton which extendt-o the edge of 'thefabric and are secured by the looper athread.

In the drawings a Fig. 1 is a 'viewin plan showing more or .15 lessdiagrammatically the essential. features of an overedge stitching'mechanism with the improvedtake ap which engages thenlooper threadbetween successive :StltChGS for drawing the same taut.

:20 vFig.Qisa ieW partly insectionand partly in side elevation showingthe .feedbar', the feed dog, the :meansa-for operating the feed .dogandthemannerof.supporting the looper thread take-upon the feed bar.

t ,Fig. 3 .is' a perspective view showing the .needle ,.the. loopers,the stitch finger and the rlooperthread take-up; the =presser foot .isshown moved \out of position to expose the .parts beneath .the .same.

" Fig. i4: is a diagrammatic View onan en:

.larged .scaleshowin-g a dabrieseetion having 7 the o eredgi-ng stitchesapplied thereto .by

any improyed overedgingmechanism. F Fig-5 is .a view partly in plan andpartly in section showing diagrammatically the :neesdleathesthreadcarryingthelooper, the amtiliarylooper, the feed anemia the looperthread,;.take.up. I p

. The "invention is directed to an oVeredge stitching mechanism. whichincludes aneedle .a thread carrying looper cooperating with .the needle[beneath the fabric and forming .a lloopy-which .is ;:passed throughthe. needle thread-loop. Also cooperating with :the loop- ("or .and..needle .isan auxiliary loop carrying im plement which engages thelooper thread and forms a loop therein for the needle-to enter-onitsnextldescent. This loop carrying im plement is so mounted .as to move me5 direction rearwardly l-ast well ;as.transversely 373,754, and inGermany July '11, 1928. i

or STUTTGARTQGERMANY, ASSIGNOR 'ro UNION srncmii MASGHIN of;the line of.feed during the feeding of the fabric. ,Associated with these overedgestitch forming elements is alooper thread take-up which .is mounted onthe feed baran'd moves with the feed bar. This looper thread takeupengages the looper thread'between successive stitches and draws onthethread soas to practically pull the looper thread straight. Inasmuch .asthe needle thread loop is passed throughthe looper thread loop this willdraw theneedle thread above the fabric to the edge of the fabric so'thatthe needle threadbetween successivestitches is laid substantially intoloop form. i

Referring to Fig. 4 ofthe drawings, the fabric being stitched is:indicated at 31; the needle punctures at .30., The needlethread isindicated at n. 1. This needle thread is formed into aloop which ispassed through the fabric and the looper thread? is passed in loop formthrough the needle thread loop. This needle thread loop is indicated ata in Fig. 4. The movement of the loop into the needle thread loop drawsthis needle thread loop which is beneath the fabric well out to the edgeof the fabric. The looper. thread which is formed into a loop isicarriedover the fabric .so that the needleenters the loop on its next descent..The looper thread, as clearly shown inFig. 4,.is drawntaut and as aresult the :loop is. taken out of the looper thread and this will pulltheneedle thread which passed. in loop form through the looper threadloop tothe edgeof the .fabricythus forminga loop in the-needle threadbetween L successive stitches. n :in the drawings. i y

TRefe-rring more in detail to the mechanism for accomplishing thisresult, the machine is shown as provided with a needle 29 through Thisloop is indicated at which aneedlethread nis passed. It is also providedwith alooper 1 which carries the looper 1- is mounted on a loopercarrier QWlliCll is attached to a collar 3 in turn mounted on ashaft 4.The shaft l carries a'slee-ve which is fixed thereto and this. sleeve-is provided with an arm 6 attached to a link 5; The link 5 is given anendwise movement whiclrimgparts an oscillation to thelooper, 1. Thisthread 7. This thread carrying looper causes the looper 1 to move intoand out of the needle thread loop.

Cooperating with this looper is a loop carrying implement 9. The loopcarrying implement 9 is mounted on a carrier 10 fixed to the collar hiwhich in turn is attached to the upwardly inclined shaft 12. The shaft12 is provided with a sleeve carrying an arm 14 to which a link 13 isconnected. As the link 13 is reciprocated. the loop carrying implement 9will be oscillated and moved so as to engage the looper thread 7 andcarry the looper thread in loop form over the fabric, positioning thesame for the needle to enter 011 its next descent.

The loop carrying implement 9 is provided with a notch 15 which engagesthe looper thread and carries it over the fabric in loop form. Thematerial is fed across the work support by a feed dog 22 mounted on afeed bar 21 which is connected to a feed rocker 20. The feed rocker 20is provided with an arm 19. and an eccentric strap 18 connected to saidarm cooperates with an eccentric 17 on the main shaft 16. The feed baris raised and lowered by an eccentric 23 on the main shaft 16. Alsomounted on the feed bar is a bracket 25. Said bracket is secured to thefeed bar 21 by a screw 26 passing through a slot 27 in the bracket. Thisbracket is provided with the usual needle guard 28. This needle guard isso positioned that when the needle passes down through the fabric itwill engage the rear face of the needle if it is deflected and insurethat it is properly positioned so that the looper will pass in rear ofthe needle and not strike the same.

Also mounted on this bracket 25 is the improved looper thread take-up24c. Associated with the stitching mechanism is a stitch finger 33carried by a combined sup.- porting bracket and edge guide 32 whichguides the edge of the fabric section 31 as it is directed to thestitching mechanism. As the stitches are formed they are formed aboutthis stitch finger 33 and are then fed oil from the end thereof.

From the above it is believed that the operation of the machine will beobvious; the needle passes through the fabric throwing out its usualloop which is entered by the thread carrying looper. The loop carryingimplement engages the looper thread and forms a loop therein which iscarried over the edge of the fabric and positioned for the needle toenter. As theneedle is passing down into the fabric the feed dog ismoving toward the front of the machine preparatory to engaging thefabric for feeding the fabric a stitch length when the needle is out ofthe fabric. On this forward movement of the feed bar the looper threadtake-up engages the looper thread. between the previously formed stitchand the concatenation of thread loops which have just been formed andwhich are being drawn up as the needle descends. This pulls the looperthread taut taking out of the looper thread the loops which are formedtherein. This straightening of the looper thread will pull the needlethread strands passing therethrough to the edge of the fabric section.This forms in the needle thread practically a loop located betweensuccessive needle punctures, which loop extends all the way to the edgeof the fabric section. The looper thread is straight and is interwovenwith the needle thread loop passing through the needle puncture and theloop in the needle thread between successive needle punctures.

lVhile I have shown the take-up as mounted on the feed bar and movabletherewith, it will be understood that this takeup may be otherwiseformed and operated. The essential feature consists in the engagement ofthe looper thread so as to draw the same taut and thus produce needlethread loops on the upper and lower faces of the fabric section whichare united at the edge of the fabric section. There is an advantage,however, in the mounting of the finger on the feed bar for the reasonthat when the length of the feed stroke is varied, the pull of thefinger on the looper thread will likewise be varied so as tomaintain itsproper action on the looper-thread.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent, is z I 1. An overedging sewing machineincluding in combination a thread carrying needle, a thread carryinglooper adapted to enter the needle thread loop, a loop carryingimplement adapted to engage the looper thread and form a loop thereinand position the same for the needle to enter. and means for engagingthe looper thread between the looper and the previously formed stitchfor drawing on said looper thread during the setting of the stitches soas to lay said looper thread substantially straight at the edge of thefabric section. thus forming loops in the needle thread on the upper andlower faces of the fabricwhich extend to the edge of the fabric Isection.

2. Any overedging sewing machine including in combination a threadcarrying needle, a thread carrying looper adapted to enter the needlethread loop. a loop carrying implement adapted to engage the looperthread and form a loop therein and position the same for the needle toenter, a four-motion feeding mechanism including a feed bar and feed dogfor feeding the fabric, and means carried by the feed bar for engagingthe looper thread when the feed bar is moved forward and for drawing onsaid looper thread during the setting of the stitches so as to lay saidlooper thread substantially straight the fabric section, thus formingloops in the v at the edge of needle thread on the upper and lower facesof the fabric which extend to the edge of the fabric section.

3. An overedging sewing machine including in combination a threadcarrying needle, a thread carrying looper adapted to enter the needlethread loop, a loop carrying implement adapted to engage the looperthread and form a loop therein and position the same for the needle toenter, a feed bar, a feed dog carried thereby, a finger carried by saidfeed bar and adapted to engage the looper thread 7 when the feed bar ismoving forward and for drawing on said looper thread during the settingof the stitches so as to lay said looper thread substantially straightat the edge of the fabric section. thus forming loops in the needlethread on the upper and lower faces of the fabric which extend to theedge of the fabric section. V

4. A sewing machine including in combination. a feeding mechanism, anoveredging stitch forming mechanism including a needle and a threadcarrying looper. and means for engaging the looper thread between thelooper and the previously formed stitch for drawing on said looperthread during the setting of the stitches so as to lay said looperthread substantially straight at the edge of the fabric section beingoveredged.

5. A sewing machine including in combination. a feeding mechanism, anoveredging st tch forming mechanism including a needle and a threadcarrying looper. and means for engaging the looper thread between thelooper and the previously formed stitch for drawing on said looperthread during the setting of the stitches so as to lay said looperthread substantially straight at the edge of the fabric section beingoveredged, said looper thread engaging means being actuated by saidfeeding mechanism. 7

6. In a sewing machine, the combination of a feeding mechanism, anoveredging stitch forming mechanism including a needle and a threadcarrying looper. said feeding mechanism including a feed bar. and afinger adjustably mounted on said feed bar and positioned so as toengage the looper thread between the looper and the previously formedstitch. for drawing on said looper thread during the setting of thestitches, so as to lay said looper thread substantially straight at theedge of the fabric section.

In testimony whereof, I afi'ix my signature.

ERNST HAUSSLER.

